Cu-added Ni—Cr—Fe-based alloy brazing material

Abstract

A Ni—Cr—Fe-based alloy brazing filler material to which Cu is added, and which has a low melting temperature, and is inexpensive and excellent in corrosion resistance and in strength, for use in manufacture of stainless-steel heat exchangers or the like, specifically, a Ni—Cr—Fe-based alloy brazing filler material, including, in mass %, Cr: 15 to 30%; Fe: 15 to 30%; Cu: 2.1 to 7.5%; P: 3 to 12%; and Si: 0 to 8%; and the balance being Ni and unavoidable impurities, wherein the total content of Cr and Fe is 30 to 54%, and the total content of P and Si is 7 to 14%.

The invention claimed is: 
     
       1. A Ni—Cr—Fe-based alloy brazing filler material, consisting of, in mass %,
 15 to 30% of Cr; 
 15 to 30% of Fe; 
 2.1 to 7.5% of Cu; 
 3 to 6% of P; 
 1 to 4% of Si; 
 0 to 1% in total of at least one of B and C; 
 0 to 5% in total of at least one of Mo, Co, Mn, and V; 
 0 to 2% in total of at least one of Sn, Zn, and Bi; 
 the balance being Ni and unavoidable impurities, 
 wherein the total content of Cr and Fe is 30 to 54%, and the total content of P and Si is 7 to 10%, 
 and wherein the Ni—Cr—Fe based alloy brazing filler material has a liquidus-line temperature of less than 1050° C. 
 
     
     
       2. The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the content of Cu is more than 2.5% and less than 6%. 
     
     
       3. The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the total content of P+Si is more than 8% and 10% or less. 
     
     
       4. The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the content of Cu is more than 3% and less than 6%, and the total content of P+Si is more than 8% and 10% or less.